Non-pipe-mashing wrench



Jan. 25, 1944. A. BOYNTON 2, 6

NON PIPE-MASHING WRENCH Original Filed Jan. 31, 1939 A ZezanderBqyniomgrwwwtop Patented Jan. 25, 1944 UNITED STATES PATENT OFFICE Originalapplication January 31, 1939, Serial No. 253,882. Divided and thisapplication October 2-3, 1941. Serial No. 416.266

1 Claim.

My invention relates to wrenches and particularly to pipe wrenches ortongs.

The objects are to provide a wrench that, (1) will not mash the pipe,(2) will not score or cut the pipe by embedding teeth as deeply as otherwrenches do, (3) will not slip on the pipe, and (4) may be more quicklyapplied or removed than any other means for making up or breaking outpipe without damaging the pipe.

I accomplish the foregoing purposes by means of two pipe grippers hingedtogether, one being hinged upon a handle and the other being adapted tobe urged toward the first one by means upon the handle, as will morefully appear from the accompanying drawing, in which Fig. 1 is an edgeview of an assembly of this invention further shown in Fig. 2.

Fig. 2 is a top plan view of the assembly shown in Fig. 1.

Similar characters refer to similar parts throughout the two views ofeach embodiment.

In Figs. 1 and 2, the handle II is hinged upon the pipe gripper I3 bythe bolt I2. The pipe gripper I4 is hinged in turn upon the pipe gripperI3 by the bolt I5. The dog I6 is hinged upon the handle II by the pin 29secured by the cotter key 2|. The flat spring I8 is secured upon the dogI B by the pair of screws [1 so that the latch pin I9 is urgedresiliently by said spring to engage within a shallow depression uponthe handle H (see Fig. 1) when the assembly is in the position shown inFig. 2.

To engage the wrench upon the pipe (not shown) the dog It is pulledbackward away from the pipe gripper I 4. The latch pin I9 will bedisengaged thereby from its socket in the handle H (see Fig. 1). Thepipe grippers l3 and I4 may be opened then to allow them to be placedabout the pipe. The dog l6 then is moved backward to the position shownin Fig. 2, with the latch pin engaged upon the smooth surface of thehandle II. If the pipe grippers I3 and I4 then are urged upon the pipewith one hand, while the handle is pulled clockwise toward the pipe withthe other hand, the dog I6 will slide upon the straight surface Md;thereby causing the pipe grippers to engage their teeth l3a and Ida uponthe pipe.

The wrench may be now pumped to release the pipe grippers each time thehandle is pushed anti-clockwise away from the pipe, and to engage themagain as in the first instance each time it is pulled clockwise towardthe pipe. In this pumping operation the dog I6 is held from releasingthe finger Hic at the extremity of the arm Mb by the latch pin I9. Thearcuate expansion Ila of the handle II provides that the latch pin I9will ride upon the handle in all positions of the dog I5.

In this invention, a different sized pair of pipe grippers, of course,will be required for each difierent diameter of pipe.

It is apparent that minor changes and substitutions can be made withinthe scope of the stated objects and appended claim and I reserve theright to make such changes and substitutions.

This application is a division of my application filed January 31, 1939,Ser. No. 253,882.

I claim:

In a pipe wrench: a handle having an offset portion adjacent one end; apipe gripper pivoted at one of its ends to said one end of the handle; asecond pipe gripper pivoted at one of its ends to the other end of thefirst pipe gripper, said second pipe gripper having a straight edgeportion adjacent its free end and an arm extending at an angle to saidstraight edge portion and forming a finger which is movably positionedin said ofiset portion of the handle when the wrench is in use; a dogpivoted to said handle adjacent said oifset portion of the handle andhaving a free end for engaging said straight edge portion and having afinger for engaging the finger of said arm when said dog end is movedaway from said straight edge portion by movement of said handle; and aspring loaded latch device for releasably securing said dog in itsoperative position during operation of the wrench.

ALEXANDER BOYNTQN,

